C++ (Cpp) PPCEmuAssembler::lahf Examples

Example #1

File: jit_integer.cpp Project: archshift/decaf-emu

// Update cr0 with value
static void
updateConditionRegister(PPCEmuAssembler& a, const asmjit::X86GpReg& value, const asmjit::X86GpReg& tmp, const asmjit::X86GpReg& tmp2)
{
   auto crtarget = 0;
   auto crshift = (7 - crtarget) * 4;

   a.mov(tmp, a.ppccr);
   a.and_(tmp, ~(0xF << crshift));

   a.cmp(value, 0);

   a.lahf();
   a.mov(tmp2, 0);
   a.sete(tmp2.r8());
   a.shl(tmp2, crshift + ConditionRegisterFlag::ZeroShift);
   a.or_(tmp, tmp2);

   a.sahf();
   a.mov(tmp2, 0);
   a.setg(tmp2.r8());
   a.shl(tmp2, crshift + ConditionRegisterFlag::PositiveShift);
   a.or_(tmp, tmp2);

   a.sahf();
   a.mov(tmp2, 0);
   a.setl(tmp2.r8());
   a.shl(tmp2, crshift + ConditionRegisterFlag::NegativeShift);
   a.or_(tmp, tmp2);

   a.mov(tmp2, a.ppcxer);
   a.and_(tmp2, XERegisterBits::StickyOV);
   a.shiftTo(tmp2, XERegisterBits::StickyOVShift, crshift + ConditionRegisterFlag::SummaryOverflowShift);
   a.or_(tmp, tmp2);

   a.mov(a.ppccr, tmp);
}